Coruscant

Coruscant was a planet in the Core of the Galaxy. It was a ecumenopolis, and thought to be the most populous planet in the Galaxy. It was an immensely important world throughout much of recorded history, being the capital of the Galactic Republic for 25 millenia. It was the homeworld of the Zhell and the Taungs.

Coruscant was known as Notron during the time of the Celestial Empire, known as the Imperial Center during the reign of Sheev Palpatine, nicknamed the Queen of the Core by many denizens of the Republic and known in military lingo as 0-0-0 or triple zero.